当然，这只能是匿名内容；一旦它成为下行流之后，您就再也不会看到这些请求，并且再也无法执行身份验证以阻止对它的访问了。

Of course, this can only be anonymous content; once it's downstream, you won't see the requests anymore and can't perform authentication to prevent access to it.

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有线电视运营商设备上的cablemodem在以5 m hz至42 mhz频段的不同上行流频率组合上接收所有下行流cablemodem的信号。

The cable modem at the cable operator's facility receives signals from all the downstream cable modems on a different set of upstream frequencies in the 5-mhz to 42-mhz band.

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美国航空航天局电视视频流和下行信息，请访问。

For NASA TV streaming video and downlink information, visit.

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